Creating Website (With functionality, PhP, MySQL, Video).

I am looking to create a type of social website. I have already started the intial stages and got stuck on the login process. I am using php language and using mysql database. I am looking for some to complete the website. I do have a visual layout of it, a couple of pages. But most importantly, I need some one to handle the functionality. I could clean up look at the end if needed. The functionality needs, besides fixing the login/logout. I need to be able to post comments/and replies, have a user profile, and have a differnet profile for "a subject" (the product or idea that I want to create profiles for) and I want the ability to add other users as friends and seperatly add "the subjet's" profile as interest in another section. Update a single user profile pic. And a page to run video (ex:Silverlight from MIcrosoft)